Evolution of very small dust particles in molecular clouds observed with ISOCAM

Details Evolution of very small dust particles in molecular clouds observed with ISOCAM Evolution of very small dust particles in molecular clouds observed with ISOCAM

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..177a&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

Scientific paper

In the mid-infrared, the sensitivity of ISO is such that observations of interstellar regions with limited excitation have been performed. The observed emission is due to very small particles (<10 nm) transiently heated each time they absorb a UV photon. The exact nature of these particles and of their evolution in the life cycle of the interstellar mattter still need to be elucidated. The ISO archive, containing both broad-band images and spectra at high and low spectral resolution, is a unique tool to achieve this goal. We present an analysis which combines high angular resolution sprectro-imaging observations of ISOCAM with high spectral resolution data of the SWS. Systematic evolution of the very small particles are found at the illuminated edges of molecular clouds.

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